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No. 752,232.v PATENTED FEB. 16, 1904,

- J. P. LAJOIE.

FLUID PRESSURE MOTOR.

APPLICATION FILED MAR. 2a. 1903 no MODEL. 1 2SHEBTSSHEET 1.

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No. 752,232. 2 PATENTED FEB. 16, 1904; J. P. LAJOIE.

FLUID PRESSURE MOTOR.

V APPLICATION FILED MAR. 23. 1903. K0 MODEL. 2 SHEETS-SHEET 2 5 5 i 5 p5 1 v a 5 i I Patented February 16, 1904.

UNITED STATES PATENT OFFIC JULES PAUL LAJOIE, OF PARIS, FRANCE.

FLUID- -PRESSURE MOTOR.

SPECIFICATION forming part of Letters Patent No. 752,232, dated February16, 1904:.

Application filed March 23, 1903.

To all whom, it may concern.-

Be it known that I, JULEs PAUL LAJOIE, a citizen of the Republic ofFrance, and a resident of Passage du Havre 31, Paris, France, haveinvented new and useful Improvements in Fluid-Pressure Motors, of whichthe follow ing is a specification.

This invention relates to anew or improved vertical motor adapted to bedriven by means of gaseous carbon dioxid.

One form of the invention is illustrated, by way of example, in theannexed drawings, in which Figure 1 is an elevation of the motor, partlyin section; Fig. 2, a cross-section on the line connecting-rods c c 0 con one motor-shaft d.

Two of the cylinders 05 a receive the driving fluid at high pressure.The other two cylinders, which are of larger diameter, receive theexpanded fluid from the cylinders a a, respectively. There are thuspractically two distinct compound motors working on the same shaft. Ineach of these two compound motors the cranks belonging, respectively, tothe high-pressure and low-pressure cylinders are at an angle of onehundred and eighty degrees to each otherthat is to say, lie in one planewhich cuts the axis of the shaft (1. In order that the dead-point willbe easily overcome, the cranks belonging to the respective motors are inplanes which out each other perpendicularly. The entire system thuspractically comprises two compound motors, the cranks of which arerespectively at right angles to each other. The four cylinders aremounted on a cast-iron frame 9, supported by pedestals it, which serveas guides for the cross-heads of the piston-rods and are fixed to abed-plate a, which carries the hearings j for the motor-shaft cl. Thelatter has at one end Serial No. 149,071- (No model.)

a fly-wheel k and can be provided at the other end with a pulley.

In each group of motorsthat is to say, in I each of the two compoundmotors-the distribution of the driving fluid is efiected by means of sixvalves, which are inclos'ed in identical boxes Zin vertical groups ofthree. The said boxes can be placed symmetrically to the right hand andleft hand, respectively, of the plane containing the cylinder-axes, orthe two groups of valves can be placed one above the other in thevertical plane passing through the axis of the crank-shaft, as shown inFig. i. In the former case the valves are controlled by means of tworods m, which have guides at and 0 and each of which has at its upperend a triangular plate p in contact with the valve-spindles q and at itslower end an arm 7, carrying a roller 8, adapted to bear on a cam t,mounted on the shaft d. A spring 12 serves to hold the said roller incontact with the cam. In the second case only one cam-operated rod on isused, which operates the uppergroup of valves during its upward movementand the lower. group of valves during its downward movement. Since thevalve-boxes are all identical with each other, it will be suflicient todescribe one. Inside the box Z a seat a is provided, adapted to supportthe valve o. A spring m tends to hold the'latter continuously againstthe said seat. The spindle q of the said valve isadapted to slide in astufling-box y and terminates in a rounded end, against which thetriangular plate 19 bears. The fluid to be distributed enters at theport 2 concentric with the valve and passes out through the lateral port1.

Fig. 6 diagrammatically represents the connection between the valvesthemselves and between the valves and the cylinders. In each group ofthree valves one box 18 or 15 receives the fluid supplied by the pipe 2.This box communicates with one end of the respective high-pressurecylinder. Another box 13 or 16 communicates with the corresponding. endof the low-pressure cylinder and with an exhaust-pipe 3, and the thirdbox 14: or 17 communicates with the opposite ends of the two cylinders.Assuming the small piston to be at the lower end of its stroke, as shownin Fig.

6, the large piston will be at the upper end of its stroke, supply willbe required below the small piston. For this purpose the valve of thebox 18 must be open, the gas contained in the large cylinder must beexhausted into the atmosphere. The valve of the box 13 must thereforealso be open and also the valve 14 of the box, in order to allow thefluid contained in the small cylinder to pass to the large cylinder. Inthe other group, the admission taking place at the lower end of thesmall cylinder, the valve of the box 15 will be closed. The exhausttaking place at the lower end of the large cylinder, the valve of thebox 16 will be closed, and since the two cylinders communicate with eachother at their upper parts the valve of the box 17 will be closed. Itwill thus be clearly seen that the distribution is effected by means ofthe alternate opening and closing of the valves of each group, theclosing of one group coinciding withthe opening of the other. Thereversing of the engine is therefore effected by reversing the openingand closing of the valves. For this purpose the cam has threeprojections 4 5 6, of which the two extreme ones are identical and havethe same throw. The cam mounted against rotation on the shaft cl isadapted to slide on the latter between two stops 7 and 8 during itsrota-.

tion, so as to present to the rollers s of the rods m projections 4 and5 for rotation in one direction and projections 5 and 6 for rotation inthe other direction. The cam can be displaced for this purpose by meansof the rod 9, which is adapted to operate the bifurcated levers 10,which engage a collar 11, adapted to slide with slight friction in acircular groove formed in the cam.

This motor, which has been specially combined for use withcarbon'dioxid, can obviously be worked by means of any other gaseousfluid.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed,

I declare that what I claim is A fluid-pressure motor of four cylindersarranged two and two and of which the cranks are crossed at rightangles, comprising: six valves in each group of two cylinders, the saidsix valves being divided into two groups of three each, a triangularplate for each group of three valves arranged opposite the lowerextremities of said valves and fixed to one of the extremities of a rodmaintained axially by a guide in which it moves and the other end ofsaid rod being provided with a roller, a spring located between thelower face of the axial guide for the rod and a support for the same, acam provided with three projections for contacting with the rollers ofthe lower extremities of the rods of the two plates arranged oppositethe lower extremities of the two groups of three valves for each groupof two cylinders, the two extreme projections of the said cam beingsimilar to the middle projection but keyed at an angle of one hundredand eighty degrees from the latter, the said cam with three projectionsbeing mounted upon the motor-shaft but movable axially thereon, anoscillating lever for each cam of which one of the extremities engagesin an annular groove in said cam, a rod jointed at one of itsextremities and within its length jointed with theother extremity of theoscillating levers of which the first extremity is engaged with theannular groove of the cam with the three corresponding projections.

In testimony whereof I have signed myname to this specification in thepresence of two subscribing witnesses. V

J ULES PAUL LAJOIE.

